Carbureter.



C. F. JOHNSON.

CARBURETER.

APPLICATION FILED sEPT.20. I915.

Snow atom fi/zafer F Job/7500,

wi hmaoo meme 1* CHESTER F. JOHNSON, F DETROTT, MICHIGAN.

coon.

CARB'URETER.

I '0 all whom it may concern:

Be it khown that T, CHESTER F. JOHNSON, a citizen. of the United States, residing at Detroit, in the county of Wayne and State of Michigan, have invented a new and use -ful Carbureter', of which the following is a specification.

Tn the use of carburetershaving an auxiliary air valve, particularly those in which the tendency of the" valve to open is resisted by a spring, considerable annoyance is experienced on account of fluttering of the valve to and from its seat at the lower engine speeds with throttle opencaused, probably, by the factithat the intake valve of the engine is set to allow admlssionrof mixture even after the piston has reached the end of its suction stroke. The intake valve being open as stated (for the purpose of allowing a proper filling of the cylinder at intermediate and high speeds), the fresh mixture fills the cylinder relatively early in the cycle at low speeds and compression begins to be effective before the ivalve closes,

1 which in turn causes a reversal of pressures in the mixing chamber and forces the valve back upon its seat.

The present invention has reference to a device whereby the said fluttering is prevented; it 'also possesses important advantion of the engine, insures the formation of a more uniform mixture by avoiding pulsations in the mixing chamber, and renders the motor less subject to spark knock {at low speed under conditions of high-compression early-spark. While the device is of special valup when associated with an auxiltle valve of this nature associated with the main throttle valve and with avalve for controlling the admission of aux1l1arya1r; also in res1hent means whereby opposition is ta ges in that it allows more rapid acceleraand "the main throttle'y Specification of Letters Patent. Pgpfgmmttedl Jan, 23, 191?, Application filed September 20, 191.5. Serial No. 51,601. i l I l 'offered to thetendency of the air current to cause movement of the non-balanced auxiliary throttle valve; also in thedetails of construction shown, described and particularly pointed out in the claims.

In the drawings, Figure 1 isa vertical section through a carbureter in which one form of my invention is embodied. Fig. 2 is a fragmentary vertical section at right angles to Fig. 1, showing the auxiliary. throttle valve and controlling means therefor. Fig. 3 is a fragmentary elevation from the right side of Fig. 2.

Similar reference characters refer torlike parts throughout the several views.

The general features of the carbureter shown are quite similar to those disclosed in my United States Patent No. 1,095,212, dated May 5, 1914, and comprise a body 1 flared at'its lower end 2 for attachment, by means of screws 3, to a float chamber, cover 4c. The latter is provided with the upstanding annular flange 5 and has its central portion depressed-at 6 and threaded toreceive the nozzle 8 which extends down into the float chamber 9 that is secured thereto and clamped to the cover by the screw 10. Fuel is admitted to the float chamber through the passage 11, the flow being controlled by a valve 12 and float 13. Tnterposed between the body and the cover 4: and spaced from the latter, is a diaphragm 14, through the central portion of which the strangle tube v 15 depends. The flange 5 is provided with ice is a main throttle valve 25 that is actuated by a throttle lever (not'shown). The above described elements are substantially 'the same as those disclosed in my prior patent, and are shown merely for the purpose of of parts.

Extending transversely across; the mixillustrating: an approved. general relation iliary throttle ,valve of the automatic type as shown, one side 28 of which is of somewhat greater area than the other side 29,

the precise shape and relation of the, sides being susceptible to considerable variation. Asshown, the valve is cut away near the ends of the valve shaft to allow the use of washers 30, the surfaces 31 of which are m preferably spherical (the body 1 being cylindrical at this point). One end of the shaft 26 projects through the wall of the body into a hollow boss 32, with reference to which a clamping plate 33 may be ad- 115 justed by the screws 34. interposed between the clamping plate and a shoulder 35 on the boss is a tension-regulating nut 36 to which one end of a spring 38 is secured in any desiredmanner, its opposite end being soldered or otherwise attached to the end of the shaft 26. .Lheclamping plate is perforated at 39 to allow access of a screw driver to the nut' 36. A pin 4&0 (Fig. l) which projects through the wall I 525 of the mixture passage, may be used to limit the side 29 of the auxiliary valve, the

amount of stress to which the; spring 38 is-subjected at any time may be readlly de termined, whereby the proper initial adjustmixture passag'ge, a main throttle valve loment may easily be made.

While l have shown spring means for closing the valve 28'29, a similar result may be secured by so proportioning the sides of the valve that'the product of. the weight of oiie side multiplied by the dis- 40 tance of the center of gravity of the side from the axis of the throttle shaft is greater than the product of the corresponding weight and distance for the other side.-

' @peration; The auxiliary throttle valve stands in the positioh shown whenthe main throttle valve is closed. its the latter is opened, the air current causes the auxiliary throttle valve to gradually swingi'n a clockwise direction toward the-longitudinal central plane of the mixing chamber; and its gradual response tothe air current tends to prevent the lagging'of the motor caused ordinarily by a sudden opening of the main throttle in accelerating from low speed when the motor is cold. It also tends to prevent surgin or pulsation of the mixture back and orth'in the mixture passage which insures a more uniform mixing of the fuel andair than otherwise takes place,

to and, it appears, does away largely with the annoying metallic sounds that occur, particularly in the larger motors, at low speed when the spark is made too early in the cycle. These efiects are also coupled with the dampening or flutter-preventing action passage, said automatic on the auxiliary air valve, heretofore menserving to control the quality of the mix-'v ture and the second, 2829, controlling the quantity."

It is clear that many changes may be made in the details of construction without departing from the spirit of my invention;

for example, the auxiliary throttle valve may be located in the manifold of the engine rather than in the carburetenbody.

ll do not, therefore, wish to be limited otherwise than as indicated by the subjoined claims.

lclaim:'. 1. Means for feeding a combustible mixture to an internal combustion engine comprising means for forming a mixture passage, means for supplying air to the mixture passage, means for supplying fuel to the mixture passage, a main throttle valve located in the mixture passage, and an auxiliary pivotally mounted non-balanced throttle vvalve also located in the mixture passage.

2. Means for feeding a combustible mixture to an internal combustion engine comprislng means for forming a mixture passage, means for supplying air to the mixture passage, means for supplying fuel to the cated in the mixture passage, and an aux- 1l1ary non-balanced throttle valve-located in the mixture passageat a point between the 9 cylinder of the engine and the main throttle valve. 1

3. Means for feeding fuel to an internal combustion engine comprising means for forming a mixture passage, means for supplying air to the'mixture passage, means for supplying fuel to the mixture passage, a

main throttle valve located in the mixture passage, an automatic pivotally mounted throttle valve also locate ,in the mixture rottle valve being arranged to be-moved in one direction by the in-rushing fuel mixture, and resilient means tending to resist the movement of said valve. I i

4. Means for feeding fuel to an internal combustion engine comprising means for forming a mixture passage, means for supplying air to the mixture passage, means for supplying fuel to the mixture passage, a

main throttle valve located in the mixture passage, an auxiliary throttle shaft extending transversely across themixture passage, an automatic throttle valve carried by the shaft, the portion of the last mentioned valve on. one side of its shaft offering greater resistance to a current in the mixture than the portion on the other side of the shaft, and

resilient means tending'to hold the automatic throttle valve in such position as to 4 partly close the mixture passage.

resilient means tending .to hold the auto- I matic throttle valve in such position as to partly close the mixture passage, and means for varying the resistance which the res1lie'nt means ofl'ers to movement of the valve.

I sage.

6. Means for feeding fuel to an internal combustion engine comprising means for forming a mixture passage, means for supplying air to the mixture assage, means forsupplying fuel to the mixture passage, a main throttle valve located in the mixture passage, an auxiliary throttle shaft extending transversely across the mixture passa e at a point between the throttle valve and the engine cylinder, an automatic throttle valve carried by the shaft, the portion of the last mentioned valve on one side of its shaft offering greater resistance to a current in the mixture than the portion on the other side of the shaft, and resilient means tending to hold the automatic throttle valve in such position as to partly close the mixture pas- Means for feeding fuel to an internal combustion engine comprising means for forming a mixture passage, means for sup-. plying a mixture of fuel and primary air to the passage, means for supplying auxiliary air to the passage, said last mentioned means including. an auxiliary air valve, a main throttle valve located in the passage, and an automatic non-balanced throttle valve also located in the mixture passage, whereby fluttering/Iof the auxiliary air valve is avoided. 8. cans for feeding'fuel to anintern'al forming a mixture passage,*means for supplying a mixture of fuel and primary air' to the passage, means for supplying aux-' iliary air to the passage, saidlast mentioned means including an auxiliaryair valve, a

.main throttle valve located in the passage,-

an automatic non-balanced throttle valve also located in the mixture passage, and resilient means tending to hold the automatic throttle valve in such position as to flpartly close the mixture passage, whereby uttering of the auxiliarv'air valve is lessened or avoided.

9. Means for feeding fuel to an internal combustion engine comprising means for I forming a mixture passage, means for supplying a mixture offuel and primary air to the passage, means for supplying auxiliary air to the passage, said last mentioned means including an auxiliary air valve, a main throttle valve located in the passage, an automatic non-balanced throttle valve also located in the mixture passage, resilient means tending to hold the automatic throttle valve in such position as to Partly close the mixture passage, whereby fluttering of the auxiliary air valve is avoided, and means 'for varying the tension of the resilient means.

10. Means for feeding fuel to an internal 2 combustion engine comprising means for forming a mixture'passage, means for supplying a mixture of fuel and primary air to the passage, means for supplying auxiliary air to thepassage, said last mentioned means including an auxiliary air valve, a main throttle valve located in the passage, a shaft for i low boss, said shaft projecting into the boss,

and a spring secured to the shaft and con cealed in the boss whereby the automatic throttle valve. is normally held in position to retard the flow of fluid through the pas sage.

11. Means for feeding fuel to an internal combustion engine comprising means for forming a mixture passage, means fdr supplying a mixture of fuel and primary air to the passage, means for-supplying auxiliary air to the passage, said last mentioned means including an auxiliary air valve, a mainthfottle valve located in the passage,-a'shaft for "an automatic throttle valve located in the passage, the means for forming a mixture passage including a hollow boss, a nonbalanced automatic throttle valve carried by the shaft,.said shaft projecting into the boss, a spring secured to the shaft and concealed ice in the boss, a clamping platecarried by the boss, a nut interposed betweenthe clamping plate and the boss andsecured to the spring,

whereby the automatic throttle-valve is normally held in position to retard the flow ofprising means for forming a mixture pas 1% sage, an automatic valve in said passage, means for supplying fuel to the mixture passage, and an automatic non-balanced throttle val \-'c located in the mixture passage.

14.. Means for feeding a combustible mixture to an internal comhustion'engine comprising means for forming a mixture passage, an automatic valve in' said passage, means for supplying fuel to the mixture passage, and an automatic throttle valve located in the mixture passage.

15. Means for feeding fuel to an internal combustion engine comprising means for forming a mixture passage, means for supplying a mixture of fuel and primary air to the passage, a main throttle valve located in the passage, a shaft for an automatic throttle valve located in the passage, a nonbalanced automatic throttle valve located in the passage, the means for forming the mixture passage including a hollow boss, a nonbalanced automatic throttle valve carried by the shaft, said shaft projecting into the boss, a spring secured to the shaft and concealed in the boss, a clamping plate carried by the boss, a nut interposed between the clamping plate and the boss and secured to the spring, whereby the automatic throttle valve is normally held in position to retard the flow of fluid through-the passage. In testimony whereof I sign this'specification.

CHESTER F. JOHNSON. 

